Probe for nuclear magnetic resonance systems
    1.
    发明授权
    Probe for nuclear magnetic resonance systems 失效
    探测核磁共振系统

    公开(公告)号:US4780677A

    公开(公告)日:1988-10-25

    申请号:US44701

    申请日:1987-05-01

    CPC分类号: G01R33/343 G01R33/3628

    摘要: An RF probe for acquiring MR data comprising four loop means. There are first and second loop means that are substantially round, centered about a longitudinal axis of said probe and spaced apart substantially the length of said probe to define a cylindrical shape therebetween. There are third and fourth loop means being substantially saddle shaped spaced apart, oppositely disposed and extending between said first and second loop means. Conductors attached to said first and second loop means at points on said first and second loop means spaced apart by 180 degrees couple said third and fourth loop means to said first and second loop means to form a point of psuedo-saddle coils providing extremely homogenous signals.

    摘要翻译: 一种用于获取包括四个环路装置的MR数据的RF探针。 存在基本上圆形的第一和第二环形装置,其围绕所述探针的纵向轴线居中并且基本上间隔开所述探针的长度以在其间限定圆柱形形状。 存在第三和第四环形装置,其基本上鞍形间隔开,相对设置并在所述第一和第二环路装置之间延伸。 连接到所述第一和第二回路装置上的导体在所述第一和第二回路装置上的间隔180度的点将所述第三和第四回路装置耦合到所述第一和第二回路装置,以形成提供非常均匀的信号的伪装鞍形线圈 。

    Reducing respiratory motion artifacts in nuclear magnetic resonance
images
    2.
    发明授权
    Reducing respiratory motion artifacts in nuclear magnetic resonance images 失效
    减少核磁共振图像中的呼吸运动伪影

    公开(公告)号:US4930508A

    公开(公告)日:1990-06-05

    申请号:US177699

    申请日:1988-04-05

    IPC分类号: A61B5/113 G01R33/567

    摘要: A reordering system for reducing respiratory artifacts in magnetic resonance images. The respiration cycle of the patient is measured and divided into N exclusive intervals. A different encoding amplitude is assigned to each interval in a first look-up table (LUT). The encoding pulses are selected by the first LUT responsive to measured respitory intervals. After M encoding pulses have been selected, a new LUT is constructed from the unused encoding pulse amplitudes using a new number (N-M) intervals. The new LUT is then used for another given number of encoding pulses. Other new LUT's are constructed after given numbers of encoding pulses are used until all encoding pulses are used.

    摘要翻译: 一种用于减少磁共振图像中呼吸赝像的排序系统。 测量患者的呼吸周期,并将其分为N个独占间隔。 在第一查找表(LUT)中对每个间隔分配不同的编码幅度。 编码脉冲由第一LUT选择,响应测量的呼吸间隔。 在已经选择了M个编码脉冲之后,使用新数(N-M)个间隔从未使用的编码脉冲幅度构建新的LUT。 然后将新的LUT用于另一给定数量的编码脉冲。 在使用给定数量的编码脉冲之后构造其他新的LUT,直到使用所有编码脉冲。

    Data compression system
    3.
    发明授权
    Data compression system 失效
    数据压缩系统

    公开(公告)号:US4777620A

    公开(公告)日:1988-10-11

    申请号:US703434

    申请日:1985-02-20

    IPC分类号: G06T9/00 H04N7/26 G06K9/00

    CPC分类号: H04N19/63

    摘要: A data compression-expansion (decrease-increase) method for improving the signal-to-noise ratio of compressed-expanded data while retaining the fidelity of the original data comprises the steps of using a filter that can be separated into a smoothing portion and an enhancing portion. The selected filter is separated into the two portions: a first portion for smoothing prior to decreasing the data, and a second portion for enhancing after increasing the data whereby the filter has the maximal effect of decreasing noise while having a minimal effect on the data.

    摘要翻译: 用于在保持原始数据的保真度的同时改善压缩扩展数据的信噪比的数据压缩扩展(减少增加)方法包括以下步骤:使用可分离成平滑部分和 增强部分。 所选择的滤波器被分成两部分:用于在减少数据之前进行平滑的第一部分和用于在增加数据之后增强的第二部分,由此滤波器具有降低噪声的最大效果,同时对数据具有最小的影响。

    Misregistration correction
    5.
    发明授权
    Misregistration correction 失效
    错位校正

    公开(公告)号:US4641352A

    公开(公告)日:1987-02-03

    申请号:US630326

    申请日:1984-07-12

    IPC分类号: G06T5/00 G06K9/00

    CPC分类号: G06T5/006

    摘要: A misregistration correction system that corrects for artifacts generated by the movement of a subject being imaged during the interval between temporally separated images. The system reduces the effects of secondary characteristics on the determination of a vector between a point on a first image and a point on a second image, which vector delineates the motion of the subject.

    摘要翻译: 一种对准校正系统,其校正由时间分离的图像之间的间隔期间被成像的被摄体的运动产生的假象。 该系统减少二次特性对第一图像上的点和第二图像上的点之间的矢量的确定的影响,该矢量描绘了对象的运动。